Furnace.



Patented July '7, 1914n E. PEDBRSBN.

FURNAOB. APPLIOATION Hum 251x521. 19121.

NW 2 WA x CARL EMIL PEDERSEN, OFCHRISTIANIA, NORWAY.

FURNACE.

Specification of Letters Patent.

Patented July 7,19141 Application filed `February 21, 1914. Serial No.820,091.

ATo r/ZZ ui/1.0m it may concern Be it known that I, Cam. EMIL PnnnnsnN,a subject of the King of Norway, residing at lilkebergveicn 3,Christiania, Norway, have invented certain new and useful Improvementsin Fiiirnaces; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a pa'rt of thisspecification.

Thepresent invention relates to an arrangement in'furnaces for heatingnails, blanks of various kinds, etc., the construction of which isintended for quickly heating a large number of blanks in a furnace usinglittle fuel.

In the accompanying drawing` is illustrated a constructional form of thefurnace Vwhich is especially intended for heating nails.

Figure 1 is a vertical longitudinal section through the furnace,partially in elevation. F ig. 2 is a plan view of the furnace.

The furnace is operated with compressed air which is supplied to thefire box partly through a pipe, a, opening below the grate, b, andpartly through the top wall of the fire box through the opening cthrough which also the fuel (coal-powder) may be introduced. This blastfrom above serves 'inter alia to prevent the blast on the underside ofthe grate from whirling away the fuel from the grate. Thus it serves asit were to balance the blast from below.

Extending upwardly from the base 10 of the furnace is an angularpartition wall comprising the substantially vertical branch 11 and thehorizontal branch 12. The horizontal branch 12 of the partition wallextends rearwardly in the furnace and stops a considerable distanceshort of the backV wall 13. Depending from the top wall 14 of thefurnace is a second angular partition wall comprising a vertical. branch15 and a horizontal branch 16 extending parallel to the horizontalbranch 12 of the first mentioned wall. The end ofthe branch 16 stopsshort of the vertical branch 11. The horizontal branch 12 is spaced awayfrom the top Wall 14 of the furnace and from the horizontal branch wall16 so that a space, forming a heatingchamber, is provided both above andbelow the horizontal branch 12, the upper surface of the branch 12forming a support in one of the chambers for the articles to be heatedtherein, and the upper surface of the branch 16 forming a support in theother chamber for the articles to be heated therein.

From the fire box, (Z, the flame passes through the flue c, which isdisposed at the top of the furnace. In this flue `is the heating chamberf in which the blanks requiring the most intense heating, are introducedthrough the opening, g, in the top of the furnace. Immediately behindthe chamber 7 the flue deflects downwardly and returns in a passage, 7L,in the opposite direction. Disposed in this passage is the secondheating chamber, z', which is intended for blanks not requiring to beheated quite as much as the blanks in the chamber f. Immediately behindthe chamber z', the flue again deflects downwardly to again pass in theopposite direction below the chamber 2', after which the fire gases aredischarged from the furnace through a vertical passage j. The flue, aswill be seen from the drawing will get the form more or less of aflattened S.

An essential condition of the heating eil-'ect of the furnace is thatthe flue should deflect downwardly immediately behind the heatingchamber. Thereby the flame and the fire gases, which will otherwisefollow the top wall of the passage, will be forced down against theplate .7c or Z, respectively, on which the blanks are placed so that thesame will be heated in a very short time to a high temperature.

The blanks are removed through the lateral openings m, n which ifdesired may be provided with doors. Generally, however, these will besuperfluous.

The body of the furnace itself is formed in this construction by twostones placed on their edges and cach of which constitutes one half ofthe furnace. The body of the furnace, however, may also be made of alarger number of stones or only of one single stone suitably formed, thewhole furnace being generally not made of a larger size than will enableit to be readily moved from one place of operation to another by acouple of attendants which is a matter of great importance in using' thefurnace as a nail furnace. Of course there is, however, nothing toprevent the same principle to be applied to furnaces with greaterdimensions.

I claim:

A furnace havinga fire box near one end thereof and a discharge fluenear the opposite end thereof, one end Wall of said fur nace forming oneWall of said flue, an angular partition in said furnace having onebranch parallel to said furnace end Wall to form the opposite Wall ofsaid flue, and a second branch forming an article support extendingtoward but stopping;- short of said fire box, said second branch beingbetween and spaced away from the base and the top of the furnace, and'asecond angular partition lhaving one lbranch forming one Wall of thelire box and a second branch forming an article support extending towardbut stopping, short of the first mentioned branch of said firstmentioned partition1 said last named article support being between andspaced away from the top of the furnace and the lirst mentioned articlesupport.

In testimony that I claini the foregoing as my invention, I have signedniy name in presence of two subscribing Witnesses.

CARL EMIL PEDERSEN.

I/Vitnesses:

M. GUTTERMAN, B. LINDs'rRM.

Copies of this patent may be obtained for ve cents each,

by addressing the Commissioner of Patents,

Washington, C.

...AMI-

